212651948551 has 4 divisors (see below), whose sum is σ = 243030798352. Its totient is φ = 182273098752.

The previous prime is 212651948549. The next prime is 212651948569. The reversal of 212651948551 is 155849156212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212651948551 - 2¹ = 212651948549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212651948495 and 212651948504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212651948591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15189424890 + ... + 15189424903.

It is an arithmetic number, because the mean of its divisors is an integer number (60757699588).

Almost surely, 2^212651948551 is an apocalyptic number.

212651948551 is a deficient number, since it is larger than the sum of its proper divisors (30378849801).

212651948551 is an equidigital number, since it uses as much as digits as its factorization.

212651948551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30378849800.

The product of its digits is 864000, while the sum is 49.

The spelling of 212651948551 in words is "two hundred twelve billion, six hundred fifty-one million, nine hundred forty-eight thousand, five hundred fifty-one".